CN105781126A - Construction method for passively building prestress on beam string structure - Google Patents
Construction method for passively building prestress on beam string structure Download PDFInfo
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- CN105781126A CN105781126A CN201610126536.7A CN201610126536A CN105781126A CN 105781126 A CN105781126 A CN 105781126A CN 201610126536 A CN201610126536 A CN 201610126536A CN 105781126 A CN105781126 A CN 105781126A
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- pull rod
- reinforcing pull
- string
- jack
- construction method
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/08—Vaulted roofs
- E04B7/10—Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
- E04B7/105—Grid-like structures
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention belongs to the technical field of building steel structures and mainly discloses a construction method for passively building prestress on a beam string structure. The construction method comprises the following specific implementation steps that 1, an intersection point of a beam string rigid beam and a beam string supporting rod is reversely jacked through a jack to enable the rigid beam to be reversely arched; 2, the verticality of the beam string supporting rod is adjusted, and a steel tie rod is straightened and pre-tightened; and 3, the jack is disassembled, and the rigid beam rebounds to enable the steel tie rod to be tensioned, so that the prestress is built on the steel tie rod. The prestress value of the steel tie rod is specified by the design, and the reverse jacking force and the reverse jacking displacement of the jack and the pre-tightening force value of the steel tie rod are calculated and determined through tensioning simulation. The prestress is built through the method, operation is easy and convenient, internal force conversion is efficient, and the forming effect of the beam string structure is good.
Description
Technical field
The invention belongs to construction steel structure technical field, essentially disclose a kind of beam-string structure and passively set up pre-stressed construction method.
Background technology
Along with the raising of China's economic level, commercial affairs, the travelling volume of the flow of passengers increase, and aircraft, as the conveying passenger flow vehicles the most efficiently, plays the effect become more and more important.Therefore, large quantities of large-scale civil airports need enlarging, newly-built.Because the public buildings such as airport are to the big demand across, large space, when structure model selection, high requirement is proposed the span ability of structure.Beam-string structure is strong with its span ability, light and handy, attractive in appearance from heavy and light, outward appearance, increasingly favored by designer, thus be widely used in space structure.
It is known that during prestressed structure construction, Shi Hanzhang need to be forced so that it is internal force and position shape meet design requirement.For beam-string structure, the especially beam-string structure of many chord members, many chord member molding internal force are uniform how to find one ensure that, the construction method of strut vertical centering, become Construction of Steel Structure circle common faced by a difficult problem.
Conventional pre-stressed construction method: 1, adopt core-theaded type jack actively stretch-draw flexibility chord member in a string tie rod end；If 2 reinforcing pull rods, it is possible to adopt the construction of calibrated wrench method, angle method.
The defect of conventional method: 1, actively stretching method operation is loaded down with trivial details, tooling device is complicated, cost is high；2, calibrated wrench method and angle method are only applicable to reinforcing pull rod pretension, and pretightning force is limited.3, both of which needs symmetrical operation, repeatedly adjusts, it is difficult to ensure that reinforcing pull rod internal force molding synchronizes.
In view of the above circumstances, the present inventor is according to theory analysis and practical experience, design the inspection through Practical Project, it is provided that a kind of beam-string structure passively sets up pre-stressed construction method, and this case thus produces.
Summary of the invention
It is an object of the invention to provide a kind of efficiency high, precision is guaranteed, and feasible beam-string structure easy and simple to handle passively sets up pre-stressed construction method.
For achieving the above object, the concrete technical scheme of the present invention is: a kind of beam-string structure passively sets up pre-stressed construction method, comprises the steps:
1) in string buckstay and a string strut point of intersection, adopt that jack is counter to be pushed up, make buckstay antiarch；Anti-top power, anti-top displacement meet calculation requirement.
2) adjust a string strut perpendicularity so that it is placed in the middle, vertical, eliminate the body of rod internal force caused because of a string strut positions deviation uneven, it is ensured that become kenel position shape to meet requirement.Straightening reinforcing pull rod, eliminates the initial deformation impact on molding internal force under Gravitative Loads.Pretension reinforcing pull rod, eliminates thread pitch, eliminates bearing pin and hole wall gap, thus eliminating reinforcing pull rod when setting up prestressing force, because primary clearance exists the loss that prestressing force is caused.
3) unloading jack step by step, buckstay resilience makes reinforcing pull rod tensioning, thus uniformly setting up prestressing force for reinforcing pull rod.
4) measure reinforcing pull rod internal force, if reinforcing pull rod internal force deficiency or ultra stretching occur, only need to repeat step 1-3 or reverse operating, reinforcing pull rod molding internal force can be made to meet requirement.
In described step 1), jack is counter push up before, beam-string structure and peripheral structure have been linked to be entirety, and buckstay, a string strut, reinforcing pull rod install.
In described step 1), the anti-power of top, anti-top displacement, according to final molding internal force requirement, adopt finite element analysis software to carry out stretching construction simulation, and iterative computation is obtained.
In described step 1), jack should show force value.Jack should be placed in reliable temporary support, and jack top should arrange cushion block, it is to avoid buckstay local compression, and buckstay correspondence position sets up ribbed stiffener.Anti-top power, anti-top displacement are all not less than value of calculation.
Further, in described step 1), it is characterised in that by anti-top, buckstay antiarch, antiarch amount, according to triangle geometry relation, the Distance Shortened of reinforcing pull rod two end node。
Described step 2) in, when adjusting a string strut perpendicularity, adopt total station survey three-dimensional coordinate, it is ensured that strut centering, vertical.Adopting chain block straightening reinforcing pull rod, regulating sleeve, makes reinforcing pull rod geometrical length shorten simultaneously, eliminate the initial deformation impact on molding internal force under Gravitative Loads.Pretension reinforcing pull rod, eliminates thread pitch, bearing pin and hole wall gap, thus eliminating reinforcing pull rod when setting up prestressing force, because of the loss that prestressing force is caused by primary clearance existence.
In described step 3), after pretension, jack step pressure reducing unloads, and buckstay resilience, owing to the length of reinforcing pull rod is fixed, the uninstall process of jack is also the loading procedure of reinforcing pull rod, thus passively setting up prestressing force for reinforcing pull rod。
It addition, in a structural system, if there being multiple parallel tension string beam structure, after anti-top, straightening, pretension complete, cushion block of can jumping a queue between temporary support and buckstay, extract jack out.In like manner all beam string are carried out anti-top, straightening, pretension.Last overall unloading, disposable sets up prestressing force for all beam string, thus eliminating the sequence of construction impact on molding internal force.
If it addition, beam-string structure is many brace rod styles, according to computational analysis, multiple anti-summit can be set in a Pin beam-string structure, in like manner beam-string structure is passively set up prestressing force.
Compared with prior art, the present invention has plurality of advantages and income effect:
One, reasonable stress, internal force are changed efficiently
Making buckstay antiarch in elastic range then pretension reinforcing pull rod by anti-top, rely on buckstay elastic recoil, passively set up prestressing force for reinforcing pull rod, it is good that prestressing force sets up course synchronization, uniformity.Generally only needing less anti-top power just can set up bigger prestressing force for reinforcing pull rod, internal force conversion is efficiently.
Two, process control, adjustment are convenient
In the process of anti-top, adopt digital display type hydraulic jack, the anti-power of top of accurate control；Rule is adopted accurately to control counter to push up displacement；It is accurately controlled that prestressing force sets up process.If stretching force deficiency or ultra stretching occur, only need repetitive operation or reverse operating, desired value can be reached, regulate facility.
Three, measure is simple, operation is convenient
Construction appliance is mainly jack, and reaction frame may utilize existing assembled bracing frame, and interim measure is conventional, simple.Construction space and interim measure frock are required low, operation facility.
Four, good economy performance
Speed of application is fast, and input manpower, measure amount are little, and measure reusable edible；Overcome the dependence to specialty unit, special work post of the tradition pre-stress construction；Ensure that the smooth enforcement of engineering, be worthy to be popularized.
Figure of description
Fig. 1 is the site plan of the invention process project；
Fig. 2 passively sets up pre-stress construction schematic diagram；
Fig. 3 is beam-string structure profile；
Fig. 4 passively sets up prestressing force principle schematic；
Fig. 5 is reinforcing pull rod straightening construction schematic diagram；
Fig. 6 is reinforcing pull rod pretension construction schematic diagram；
Fig. 7 is view before beam-string structure unloading.
Detailed description of the invention
Detailed description of the invention as shown in figs. 1-7, is described in further details by the enforcement of the present invention.
It is one of the invention process example that a kind of X-shaped intersection beam-string structure as shown in figs. 1-7 passively sets up pre-stressed construction method.As it is shown in figure 1, certain airport building steel worm-gearing area 30000, steel worm-gearing arranges large-scale skylight at middle part, and roof system is divided into symmetrical twoth district.Skylight, middle part adopts Composite Triangular star beam string form.Beam string is made up of the rigid body that winds up, lower edge reinforcing pull rod and strut between.Open string skylight long 115m, span 18m-36m, totally 13 Pin, be arranged side by side, a string vertical rod height 2.5m-3m.Every reinforcing pull rod all arranges a regulating sleeve at span centre.String skylight and both sides grid structure are articulated and connected, and reinforcing pull rod two end node is that bearing pin node is opened and arranged ball pivot node between string strut and buckstay.
During construction, roof system rack, edge sealing truss and a string skylight are assembled at flooring, after being assembled into entirety, skylight beam-string structure are set up prestressing force, and last entirety rises to design attitude.
Beam-string structure is passively set up prestressing force, and detailed step is as follows:
(1) computational analysis
Set up Whole structure model, according to overall arrangement and method for construction, it then follows passively set up prestressing method, to design the reinforcing pull rod molding internal force specified for desired value, adopting finite element analysis software to carry out stretching construction simulation, iterative computation is obtained each anti-power of top of X-shaped beam string, counter is pushed up displacement.
According to the anti-top power calculated, counter push up displacement, design bracing frame, select hydraulic jack specification.
(2) assembled
As shown in Figure 2 and Figure 3, a string buckstay 1 is arranged below bracing frame 3 with string vertical rod 2 intersection point, the reserved space placing jack 4 between bracing frame and buckstay.This bracing frame as truss string structure bracing frame, is setting up the prestressing force stage as jack reaction frame in the assembled stage.
String skylight structure is opened at assembled roof system rack 5, edge sealing truss 6 and middle part；Buckstay, a string vertical rod, a string pull bar composition entirety；And skylight structure and both sides rack, edge sealing truss are linked to be entirety.
(2) counter push up
As in figure 2 it is shown, adopt two hydraulic jack, symmetrically placed, synchronize anti-top.Jack is placed in temporary support, and jack top arranges cushion block 7, it is to avoid buckstay local compression, and buckstay correspondence position sets up ribbed stiffener 8.Anti-top process is based on power control, and namely anti-top power is not less than value of calculation；Anti-top displacement is assist control means, for checking, verify the anti-correctness pushing up power.
(3) straightening, pretension
As shown in Figure 4, Figure 5, at reinforcing pull rod 1/3rd waypoint, hang chain block 9；With opening wrench 11 on reinforcing pull rod regulating sleeve 10, turnbarrel.First make string strut perpendicularity, a centering, and adopt total powerstation to carry out three-dimensional measurement.Continue with chain block and rotating regulating sleeve straightening reinforcing pull rod, make reinforcing pull rod geometrical length shorten.Last symmetrical pretension reinforcing pull rod, pretightning force is determined by stretching construction simulation.Reinforcing pull rod straightening, pretension work by the symmetry operation of Liang Ge teams and groups, are synchronously performed.
(4) unloading
As shown in Figure 6, after anti-top, straightening, pretension, adopt interim rest 12 and sheet metal 13 to pad between bracing frame and buckstay, extract jack out.In like manner next X-shaped beam string counter is pushed up, straightening, pretension, until 13 X-shaped beam string are fully completed.Finally extracting cushion block out, the support to a string buckstay of the unloading bracing frame, buckstay resilience, thus being all reinforcing pull rod Shi Hanzhang.
(7) measure
After completion of discharge, measure the internal force of reinforcing pull rod, if ultra stretching or stretch-draw deficiency, repeatable abovementioned steps or reverse operating occur, until internal force meets requirement.
Above-described embodiment is only for illustrating the design of the present invention; and the restriction of non-invention rights protection; all utilize this design that the present invention is carried out unsubstantiality change; such as truss string structure is common plane truss, string strut is many, the flexible portion of truss string structure is cable wire etc., all should fall into protection scope of the present invention.
Claims (6)
1. a beam-string structure passively sets up pre-stressed construction method, it is characterised in that comprise the steps:
1) in string buckstay and a string strut point of intersection, adopting that jack is counter to be pushed up, make buckstay antiarch, the anti-power of top, anti-top displacement meet design requirement；
2) adjust a string strut perpendicularity so that it is placed in the middle, vertical, eliminate the body of rod internal force caused because of a string strut positions deviation uneven, it is ensured that become kenel position shape to meet requirement；Straightening reinforcing pull rod, eliminates the initial deformation impact on molding internal force under Gravitative Loads；Pretension reinforcing pull rod, eliminates thread pitch, bearing pin and hole wall gap, thus eliminating reinforcing pull rod when setting up prestressing force, because of the loss that prestressing force is caused by primary clearance existence；
3) unloading jack step by step, buckstay resilience makes reinforcing pull rod tensioning, thus setting up prestressing force for reinforcing pull rod；
4) measure reinforcing pull rod internal force, if reinforcing pull rod internal force deficiency or ultra stretching occur, only need to repeat step 1-3 or reverse operating, reinforcing pull rod molding internal force can be made to meet requirement.
2. beam-string structure as claimed in claim 1 a kind of passively sets up pre-stressed construction method, it is characterised in that: in described step 1), jack is counter push up before, beam-string structure and peripheral structure have been linked to be entirety, and buckstay, a string strut, reinforcing pull rod install.
3. a kind of beam-string structure as claimed in claim 1 passively sets up pre-stressed construction method, it is characterized in that: in described step 1), the anti-power of top, anti-top displacement, according to final molding internal force requirement, adopt finite element analysis software to carry out stretching construction simulation, and iterative computation is obtained.
4. a kind of beam-string structure as claimed in claim 1 passively sets up pre-stressed construction method, it is characterised in that: in described step 1), jack should show force value；Jack should be placed in reliable temporary support；Anti-top power, anti-top displacement are all not less than value of calculation.
5. beam-string structure as claimed in claim 1 a kind of passively sets up pre-stressed construction method, it is characterised in that: described step 2) in, when adjusting a string strut perpendicularity, adopt total station survey three-dimensional coordinate, it is ensured that strut centering, vertical；Adopting chain block straightening reinforcing pull rod, eliminate the initial deformation impact on molding internal force under Gravitative Loads, regulating sleeve, makes reinforcing pull rod geometrical length shorten simultaneously；Pretension reinforcing pull rod, eliminates thread pitch, eliminates bearing pin and hole wall gap, thus eliminating reinforcing pull rod when setting up prestressing force, because primary clearance exists the loss that prestressing force is caused.
6. a kind of beam-string structure as claimed in claim 1 passively sets up pre-stressed construction method, it is characterized in that: in described step 3), after pretension, jack step pressure reducing unloads, buckstay resilience, owing to the length of reinforcing pull rod is fixed, the uninstall process of jack is also the loading procedure of reinforcing pull rod, thus prestressing force passively set up by reinforcing pull rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610126536.7A CN105781126B (en) | 2016-03-07 | 2016-03-07 | A kind of beam-string structure passively establishes pre-stressed construction method |
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| CN201610126536.7A CN105781126B (en) | 2016-03-07 | 2016-03-07 | A kind of beam-string structure passively establishes pre-stressed construction method |
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| CN105781126A true CN105781126A (en) | 2016-07-20 |
| CN105781126B CN105781126B (en) | 2018-04-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424989A (en) * | 2020-03-13 | 2020-07-17 | 中建科工集团有限公司 | Tension construction method and construction tool for steel pull rod of net rack |
| CN112392259A (en) * | 2020-12-09 | 2021-02-23 | 北京建工集团有限责任公司 | Synchronous grading unloading method for steel truss with jacking oil cylinder replaced by double supporting points |
| CN115075399A (en) * | 2022-08-04 | 2022-09-20 | 上海市机械施工集团有限公司 | Active unloading method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424989A (en) * | 2020-03-13 | 2020-07-17 | 中建科工集团有限公司 | Tension construction method and construction tool for steel pull rod of net rack |
| CN111424989B (en) * | 2020-03-13 | 2021-09-14 | 中建科工集团有限公司 | Tension construction method and construction tool for steel pull rod of net rack |
| CN112392259A (en) * | 2020-12-09 | 2021-02-23 | 北京建工集团有限责任公司 | Synchronous grading unloading method for steel truss with jacking oil cylinder replaced by double supporting points |
| CN112392259B (en) * | 2020-12-09 | 2022-02-01 | 北京建工集团有限责任公司 | Synchronous grading unloading method for steel truss with jacking oil cylinder replaced by double supporting points |
| CN115075399A (en) * | 2022-08-04 | 2022-09-20 | 上海市机械施工集团有限公司 | Active unloading method |
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